[Bug]: WebDAV: Microsoft Powerpoint warns about unsecure sign-in method on save

[vansante]

⚠️ Before submitting, please verify the following: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• I agree to follow Nextcloud's Code of Conduct

Bug description

After creating a WebDAV share on windows, and saving a new file with Powerpoint to that WebDAV share, Powerpoint shows a warning about about unsecure sign-in method.

Steps to reproduce

1. Create a WebDAV mount on Windows (11).
2. Open Office Powerpoint
3. Create a new Powerpoint presentation
4. Save the Powerpoint presentation to a new file on the WebDAV mount.
5. The warning appears
   ...

Expected behavior

No warning appears

Which files are affected by this bug

jemoeder.pptx

Operating system

Windows

Which version of the operating system you are running.

Windows 11

Package

Other

Nextcloud Server version

27.1.2

Nextcloud Desktop Client version

n/a

Is this bug present after an update or on a fresh install?

Updated from a minor version (ex. 3.4.2 to 3.4.4)

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

Are you using an external user-backend?

• Default internal user-backend
• LDAP/ Active Directory
• SSO - SAML
• Other

Nextcloud Server logs

Empty it seems :(:


cfbf03d32393:/var/www/html# cat /mnt/ncdata/nextcloud.log
cfbf03d32393:/var/www/html#

Additional info

It seems that Office Powerpoint is doing an PROPFIND request without any authentication headers to the server, before showing the warning:

[vansante]

Just realized I filed this report in the wrong repository 🤦 . Closing, I opened a new one here